# SPDX-License-Identifier: Apache-2.0
# Copyright 2019 Western Digital Corporation or its affiliates.
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.



#Simple start up file for the reference design

#ifdef D_LLVM_COMRV
/* disable warning for reserved registers use - we are using comrv
   reserved register and don't want to see these warnings. */
.option nowarnreservedreg
#endif /* __clang__ */

  .section ".text.init"
  .global _start
  .type   _start, @function




_start:
  #clear minstret
  csrw minstret, zero
  csrw minstreth, zero

  #clear registers
  li  x1, 0
  li  x2, 0
  li  x3, 0
  li  x4, 0
  li  x5, 0
  li  x6, 0
  li  x7, 0
  li  x8, 0
  li  x9, 0
  li  x10,0
  li  x11,0
  li  x12,0
  li  x13,0
  li  x14,0
  li  x15,0
  li  x16,0
  li  x17,0
  li  x18,0
  li  x19,0
  li  x20,0
  li  x21,0
  li  x22,0
  li  x23,0
  li  x24,0
  li  x25,0
  li  x26,0
  li  x27,0
  li  x28,0
  li  x29,0
  li  x30,0
  li  x31,0


    #cache configuration
  li t1, 0x55555555
  csrw 0x7c0, t1
  fence.i
  # initialize global pointer
  .option push
  .option norelax
  la gp, __global_pointer$
  .option pop
  la sp, _sp

/* [OS] we dont have this memory to load from ----
  // Load data section
  la a0, _data_lma
  la a1, _data
  la a2, _edata


  bgeu a1, a2, 2f
1:
  lw t0, (a0)
  sw t0, (a1)
  addi a0, a0, 4
  addi a1, a1, 4
  bltu a1, a2, 1b
2:
*/
  /* Clear bss section */
  la a0, __bss_start
  la a1, _end
  bgeu a0, a1, 2f
1:
  sw zero, (a0)
  addi a0, a0, 4
  bltu a0, a1, 1b
2:

  /* Call global constructors *//*
  la a0, __libc_fini_array
  call atexit */
  call __libc_init_array


#  #hart id
#OS  csrr a0, mhartid
#OS  li   a1, 1
#OS 1:  bgeu a0, a1, 1b
    # argc = argv = 0 t0
    li a0, 0
    li a1, 0

    call benchmark
    
    #[OS]: no need for exit, just endless loop here.....was: tail atexit
  # loop here
 2:  j 2b
